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Effect of Pd and Au on Hydrogen Abstraction and C–C Cleavage in Photoconversion of Glycerol: Beyond Charge Separation
journal contribution
posted on 2020-09-07, 04:45 authored by Dongdong Lv, Yechen Lei, Dongsheng Zhang, Xin Song, Yong-Wang Li, J. W. H. Niemantsverdriet, Weichang Hao, Yonghong Deng, Ren SuPhotocatalytic
conversion of polyols to value-added products is
of great interest for the utilization of biomass as a chemical feedstock.
Current research focuses on boosting the reaction rate and selectivity
by employing metal nanoparticles (NPs) as charge separators and cocatalysts.
However, the promotional role of metal NPs in such photocatalytic
processes still remains unclear because of the lack of mechanistic
understanding. Here, we have explored the role of supported Pd and
Au NPs on TiO2 in photocatalytic glycerol conversion under
water-free, deaerated conditions by in situ spectroscopic
methods. While the presence of Au NPs only results in partial conversion
of glycerol at a low rate, Pd decoration promotes glycerol oxidation
to a much higher conversion. In situ mass and vibrational
spectrometry reveals that Pd/TiO2 exhibits faster cleavage
of O–H and C–H bonds in both glycerol and the derived
intermediates as compared to Au/TiO2, thus leading to a
higher glycerol conversion accompanied by the formation of additional
molecular hydrogen. X-ray photoelectron spectroscopy suggests that
the preferential adsorption of glycerol on the surface of Pd via hydroxyl groups results in an enhanced interfacial charge
transfer, thus yielding a better photocatalytic activity.
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photocatalytic glycerol conversionCurrent researchphotocatalytic processesCharge Separation Photocatalytic co...charge transfervibrational spectrometryhydroxyl groups resultsmetal NPscharge separatorsPd decorationmetal nanoparticlesglycerol conversionspectroscopic methodsreaction rateTiO 2Hydrogen Abstractionchemical feedstockX-ray photoelectron spectroscopyglycerol oxidationphotocatalytic activitydeaerated conditions
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